I’ve read about people who retire to cruise ships and do nothing but sail all the time. They claim it’s as cheap as living in a retirement home.

Just sailing. Around the world. Day after day.

So I’m on a cruise right now and I’m asking myself if I could stand this.

Day after day.

The upsides: Food, of course. Lots of it anytime you want it. In your room. In the dining room. On the Lido deck by the pool. Everything from steak to pasta, Japanese to French. Hamburgers and pizza.

Not only healthy food. Desserts. Chocolate molten cake with ice cream or tiramisu or fruit, if you insist on watching calories.

A person could get used to this very quickly.

Cheesy entertainment

Then there’s entertainment. Some decent bar pianos and a couple of stage shows. Well, you probably could only take so much of the comedian, not to mention the guitarist with the stringy hair and black fedora who thinks he’s Coldplay.

Then there’s karaoke. But you don’t have to go there.

Instead, watch television in your room with two movie channels, CNN, other stuff.

There’s also a daily movie on a big screen in one of the large meeting rooms. Drinks — alcohol and soda pop — do cost money but there’s always water, ice tea and lemonade. Coffee, of course. A person could survive.

How about a pool, the gym, even an adults-only hot tub?

The downsides: Internet hookup costs a fortune and unless you’re traveling with a close friend or lover, it would get tiresome not having some consistency in life.

The constant turnover of guests adds excitement, of course, but also could get dreary, I think. And no cabin is big enough to live with the same person for weeks and months and years. Still, if you could put up with that person, someone does make your bed, provide clean towels, tidy up.

I don’t know why I’m going through this exercise. I’m not ready for a retirement home anyway.

But the thought of a prolonged, unending vacation — OK, maybe just a year — has some appeal. Given the current longevity, seems to me there’s a business opportunity here for an enterprising gerontologist. Maybe take over a quarter of a ship with oldsters. Provide special programs, lectures, easy shore excursions, cheap ship-to-shore phones. Minimum sign-up: six months.

Of course, the medical staff would probably need to be increased. Not to mention the infirmary.

Otto Warmbier was arrested in January 2016 at the end of a brief tourist visit to North Korea. He had been medically evacuated and was being treated at the University of Cincinnati Medical Center when he died at age 22.